On Tue, 17 Aug 2010 15:57:56 +0200 Alexander Graf <agraf@xxxxxxx> wrote: > There are some heuristics in the PPC power management code that try to find > out if the particular hardware we're running on supports proper power management > or just hangs the machine when going into nap mode. > > Since we know that KVM is safe with nap, let's force enable it in the PV code > once we're certain that we are on a KVM VM. Could this cause the cache to be flushed unnecessarily on e500? Where available, doze would probably be better for signalling the hypervisor that the guest is idle. > > Signed-off-by: Alexander Graf <agraf@xxxxxxx> > --- > arch/powerpc/kernel/kvm.c | 3 +++ > 1 files changed, 3 insertions(+), 0 deletions(-) > > diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c > index 517da39..95aed6b 100644 > --- a/arch/powerpc/kernel/kvm.c > +++ b/arch/powerpc/kernel/kvm.c > @@ -583,6 +583,9 @@ static int __init kvm_guest_init(void) > if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE)) > kvm_use_magic_page(); > > + /* Enable napping */ > + powersave_nap = 1; > + > free_tmp: > kvm_free_tmp(); > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
